Oh I believe in the distinction. Anne McCaffrey's Pern books, Jack Vance's Emphyrio, Frank Herbert' Dune and others are of this ilk. You could say its science fiction that's like fantasy in its content, or you could just say its Science Fantasy, Sf as opposed to SFI've never really liked the idea of "science fantasy". To me, it's either science fiction or fantasy, and there's no overlap. It doesn't matter whether or not the technology is "magical", it's a more fundamental difference. Unfortunately, like all theories, the real world doesn't always want to play along... not just Lord Valentine's Castle, but is Morgan's The Steel Remains actually sf and not fantasy?